Early in the morning just before the sun starts to rise I use a barred owl call. Later in the morning or afternoon i'll use a crow call. Once, last spring, my brother and I were outside my house. It was dark outside and the sun set about two hours earlier. I had one of my dogs out and I yelled for him, All of the sudden on the ridge next to my house a good number of toms started gobbling to my yelling! It was pretty cool to hear, espescially that late at night. I think they will shock gobble at mostly anything. I have heard them gobble at thunder, truck doors slamming, gun shots, owls, coyotes, crows, train horns, etc. If you learn how to use an owl or crow call effeciently you'll get great results. Another thing you can try to do is to use a gobble call. You have to be very careful doing this though because this will attract other hunters who may be hunting in the same area. I only use this call on one of the areas that I hunt where I am the only one with permission to hunt it. Many times, i'll do a couple of yelps and get no response, so i'll do some more yelps then throw in a gobble and then i'll get a response from another tom. Many times it will get them jealous/pissed off and they'll come right in.